Add .editorconfig file

.editorconfig

@@ -0,0 +1,21 @@
+# top-most EditorConfig file
+root = true
+
+# Unix-style newlines with a newline ending every file
+[*]
+charset = utf-8
+indent_style = space
+indent_size = 2
+end_of_line = lf
+trim_trailing_whitespace = true
+insert_final_newline = true
+
+[*.{md,apib}]
+indent_size = 4
+# In Markdown a trailing double space is interpreted as <br>
+trim_trailing_whitespace = false
+max_line_length = off
+
+[*.{py,java,r,R}]
+indent_size = 4
+